Every federal tax filer picks one: take the standard deduction (a flat amount set by Congress) or itemize (list and add up individual deductible expenses). You cannot do both. The right choice can save you thousands — or cost you an evening of paperwork for nothing. Here is how to decide.
2025 standard deduction amounts
- Single and Married Filing Separately: $14,600
- Married Filing Jointly and Qualifying Widow(er): $29,200
- Head of Household: $21,900
If you are 65+ or blind, add roughly $1,550 per condition (single) or $1,250 per condition (married). These are large numbers by historical standards — before 2018, they were about half this size, and roughly 30% of filers itemized. After the 2017 Tax Cuts and Jobs Act doubled the standard deduction, itemizers dropped to about 10% of filers.
The basic decision
Add up your deductible expenses (below). If the total exceeds your standard deduction, itemize. Otherwise, take the standard.
What counts as itemizable
State and Local Tax (SALT) — capped at $10,000
The SALT deduction covers state income tax (or state sales tax, whichever is larger) plus property tax. Starting in 2018 and continuing in 2025, the total SALT deduction is capped at $10,000 ($5,000 if married filing separately). This is the single biggest reason itemizing stopped paying off for many higher earners in high-tax states.
A California family paying $20,000 in state income tax and $8,000 in property tax used to deduct the full $28,000. Now they can deduct only $10,000. The remaining $18,000 is just gone from the deduction column.
Mortgage interest
You can deduct interest on up to $750,000 of mortgage debt ($375,000 if married filing separately) for loans taken after December 15, 2017. Older loans are grandfathered at the $1 million limit. For most Americans with typical mortgage sizes, this deduction is accessible — but it shrinks every year as you pay down principal, so the deduction is biggest in the early years of the loan.
A $500,000 mortgage at 6% in year one of payments generates roughly $30,000 of interest. In year fifteen, it generates about $18,000. In year twenty-five, about $7,000.
Charitable contributions
Cash gifts to qualified charities are deductible up to 60% of adjusted gross income. Non-cash gifts (clothing, goods, stock) are deductible at fair market value, with more paperwork over $500 and formal appraisals over $5,000.
Gifts of appreciated stock held over one year are a tax-efficiency masterclass: you deduct the full market value and pay no capital gains on the appreciation. A $10,000 gift of stock with a $3,000 cost basis saves you roughly $4,500 in total tax at a typical rate, compared to selling and donating the $10,000 cash.
Medical expenses above 7.5% of AGI
Out-of-pocket medical costs (insurance premiums for non-employer-sponsored plans, co-pays, prescriptions, dental, vision, long-term care) are deductible to the extent they exceed 7.5% of your adjusted gross income. At $80,000 AGI, the threshold is $6,000 — only costs above that count. For most people this deduction only matters in major medical event years or for long-term care.
Miscellaneous deductions — mostly gone
Until 2017, you could deduct unreimbursed employee expenses, investment management fees, and tax preparation fees. The TCJA eliminated these for most filers. A few narrow categories remain (gambling losses up to winnings, investment interest, certain casualty losses in federally declared disaster areas).
The threshold calculation
Quick test for married filing jointly: to beat the $29,200 standard deduction, you need deductions above that total. A rough template:
- $10,000 (maxed SALT in a middle-tax state)
- $15,000 (mortgage interest on a ~$300K loan at 6%)
- $5,000 (charitable giving)
- Total: $30,000 — just barely above the line.
If you have no mortgage, you almost certainly take the standard deduction. If you have a newly issued big mortgage and you live in a high-tax state, itemizing is likely worth it. Middle cases can go either way and merit an actual calculation.
Strategies to itemize when you otherwise would not
Bunching charitable giving
If you normally give $8,000 per year and the standard deduction is $29,200, your giving adds zero marginal tax value — the standard deduction absorbs it. But if you give $16,000 in one year and $0 the next, and you have other deductions to push you over the threshold, the $16,000 year becomes deductible while the $0 year still gets the standard deduction.
The vehicle for this is a donor-advised fund (DAF). You contribute a lump sum, take the deduction in one year, then distribute to charities over multiple years. Fidelity, Schwab, and Vanguard all offer DAFs with low minimums.
Accelerating property tax
If you can pay next year’s property tax in December of this year, you front-load the deduction — useful in years where you already exceed the threshold. (But watch the SALT cap: if you are already at $10,000, extra property tax gets you nothing.)
Medical timing
If you have an elective procedure planned, scheduling it in a year where you already have other big medical costs can push you over the 7.5% threshold. This matters for new parents, planned surgeries, and dental work.
Run the actual numbers
Do not guess. Many people assume their mortgage interest + SALT + giving add up to a big deduction, but between the SALT cap and years of loan amortization, the real number is often smaller than mental arithmetic suggests. Our income tax calculator lets you see the tax impact of itemizing vs taking the standard deduction, so you can test both scenarios before filing.
Most tax software (TurboTax, H&R Block, FreeTaxUSA) automatically runs both paths and picks whichever is larger. Trust the software on this — the days of mostly-itemizing are over for most American filers, but not all, and the line is worth knowing on your side of.
State itemization sometimes flips the answer
Some states require you to itemize on the state return if you itemize federally — or vice versa. A few states have more generous state-level itemization rules (fewer caps), so itemizing on the state return even when you take the federal standard can be optimal. This is unusual but worth checking, especially in states with high income tax and uncapped SALT equivalents at the state level.
The simplest rule: add up your federal itemizable expenses. If the total comes within 20% of the standard deduction either way, run both calculations in your tax software. If you are clearly above or clearly below, take whichever path is bigger. The tax system does not reward itemizing for its own sake — it rewards having large deductible expenses.